Tracker 4x4 L4-1.6L VIN 6 (1995)
Fast Idle Air Valve: Description and Operation
Fast Idle Air Valve
FAST IDLE AIR VALVE
DESCRIPTION
The fast idle air valve consists of thermo-wax, springs and a valve.
OPERATION
Cold Engine
When the engine is cold (Engine Coolant Temperature [ECT] is lower than 70°C [158°F]), the thermo-wax contracts. In this state, the valve opens
by the spring force, allowing the air to be drawn into the intake manifold. Thus the amount of intake air increases even when the throttle valve is at
the idle position and the engine speed rises to the fast idle state which is higher than the idle speed.
Warm Engine
As the engine warms up, the thermo-wax expands gradually, the piston pushes down the valve gradually, and the amount of air passing through the
fast idle air valve decreases and so does the engine speed. When the ECT reaches about 70°C (158°F), the valve is fully closed and the engine
speed is back to the normal idle speed.
